now, they hold two drills a year. schoolg#:]ç resource officers he taught students some basics, may keep them alive in an inviewed troouder gets on campus. >> run, hide, and then, fight. if you need be. which we never want to happen. but run, hide and fight. >> the principal says they're more aware of the security holds. >> recognizing we have multiple access points in schools, but we have tried to ice yol yait those. so-isolate those to so we're aware. >> in columbine, officers waited for s.w.a.t. teams to assemble before going n while that happened, the shooter killed more students, now, police changed tactics. >> if there is a violent incidents ongoing, active shooter we make immediate action. we know that lives are at stake. if there is immediacy, our 8ht:sb to gather and engage.